Constantin Frantzen
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| Country (sports) | File:Flag of Germany.svg Germany |
|---|---|
| Born | 16 March 1998 Düsseldorf, Germany |
| Height | 1.93 m (6 ft 4 in) |
| Plays | Right-handed (two-handed backhand) |
| College | Baylor University |
| Prize money | US $570,983 |
| Singles | |
| Career record | 0–0 |
| Career titles | 0 |
| Highest ranking | No. 1226 (20 February 2023) |
| Doubles | |
| Career record | 45–48 |
| Career titles | 1 |
| Highest ranking | No. 42 (9 June 2025) |
| Current ranking | No. 46 (24 November 2025) |
| Grand Slam doubles results | |
| Australian Open | 1R (2024, 2025) |
| French Open | 2R (2025) |
| Wimbledon | QF (2024) |
| US Open | QF (2025) |
| Last updated on: 25 November 2025. | |
Constantin Frantzen (born 16 March 1998) is a German tennis player who specializes in doubles.
Frantzen has a career high ATP doubles ranking of world No. 42, achieved on 9 June 2025.[1]
He played college tennis at Baylor University.[2]
Career
[edit | edit source]2023–2024: ATP and Grand Slam debuts in doubles
[edit | edit source]Frantzen made his ATP Tour doubles main draw debut at the Swiss Open Gstaad alongside Hendrik Jebens.
He reached his first ATP Tour final at the Moselle Open with partner Jebens, but lost to Hugo Nys and Jan Zieliński.[3] Frantzen reached his second ATP Tour final at the 2024 Generali Open Kitzbühel also alongside Jebens but lost to Alexander Erler and Andreas Mies.[4] The pair also made it to the 2024 Hangzhou Open final, losing to Jeevan Nedunchezhiyan and Vijay Sundar Prashanth in the final.[5]
2025: Maiden ATP title
[edit | edit source]In September, Frantzen won his first doubles title on the ATP Tour at the Chengdu Open, partnering Robin Haase.[6]
Doubles performance timeline
[edit | edit source]| W | F | SF | QF | #R | RR | Q# | DNQ | A | NH |
(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
Current through the 2025 ATP Tour.
| Tournament | 2023 | 2024 | 2025 | SR | W–L |
|---|---|---|---|---|---|
| Grand Slam tournaments | |||||
| Australian Open | A | 1R | 1R | 0 / 2 | 0–2 |
| French Open | A | 1R | 2R | 0 / 2 | 1–2 |
| Wimbledon | A | QF | 3R | 0 / 2 | 5–2 |
| US Open | A | 1R | QF | 0 / 2 | 3–2 |
| Win–loss | 0–0 | 3–4 | 6–4 | 0 / 8 | 9–8 |
| ATP Masters 1000 | |||||
| Indian Wells Open | A | A | 1R | 0 / 1 | 0–1 |
| Miami Open | A | A | 1R | 0 / 1 | 0–1 |
| Madrid Open | A | A | 2R | 0 / 1 | 1–1 |
| Win–loss | 0–0 | 0–0 | 1–3 | 0 / 3 | 1–3 |
| Career statistics | |||||
| Tournaments | 5 | 20 | 25 | 50 | |
| Titles | 0 | 0 | 1 | 1 | |
| Finals | 1 | 2 | 1 | 4 | |
| Overall win–loss | 3–5 | 19–20 | 23–23 | 45–48 | |
| Year-end ranking | 65 | 52 | 46 | 48% | |
ATP Tour finals
[edit | edit source]Doubles: 4 (1 title, 3 runner-ups)
[edit | edit source]
|
|
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|---|
| Loss | 0–1 | Nov 2023 | Moselle Open, France |
ATP 250 | Hard (i) | Germany Hendrik Jebens | Monaco Hugo Nys Poland Jan Zieliński |
4–6, 4–6 |
| Loss | 0–2 | Jul 2024 | Austrian Open Kitzbühel, Austria |
ATP 250 | Clay | Germany Hendrik Jebens | Austria Alexander Erler Germany Andreas Mies |
3–6, 6–3, [6–10] |
| Loss | 0–3 | Sep 2024 | Hangzhou Open, China |
ATP 250 | Hard | Germany Hendrik Jebens |  Jeevan Nedunchezhiyan Vijay Sundar Prashanth
|
6–4, 6–7(5–7), [7–10] |
| Win | 1–3 | Sep 2025 | Chengdu Open, China |
ATP 250 | Hard | Netherlands Robin Haase | United States Vasil Kirkov Netherlands Bart Stevens |
4–6, 6–3, [10–7] |
ATP Challenger finals
[edit | edit source]Doubles: 17 (8 titles, 9 runner-ups)
[edit | edit source]| Finals by surface |
|---|
| Hard (2–5) |
| Clay (6–3) |
| Carpet (0–1) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|
| Loss | 0–1 | Sep 2022 | Columbus, United States |
Hard | United Kingdom Charles Broom | United Kingdom Julian Cash United Kingdom Henry Patten |
2–6, 5–7 |
| Loss | 0–2 | Oct 2022 | Las Vegas, United States |
Hard | United States Reese Stalder | United Kingdom Julian Cash United Kingdom Henry Patten |
4–6, 6–7(1–7) |
| Loss | 0–3 | Mar 2023 | Pau, France |
Hard (i) | United Kingdom Julian Cash |  Dan Added Albano Olivetti
|
6–3, 1–6, [8–10] |
| Loss | 0–4 | Mar 2023 | Lugano, Switzerland |
Hard (i) | Germany Hendrik Jebens | Belgium Zizou Bergs Netherlands David Pel |
2–6, 6–7(6–8) |
| Win | 1–4 | Mar 2023 | Biel/Bienne, Switzerland |
Hard (i) | Germany Hendrik Jebens |  Victor Vlad CorneaCroatia Franko Škugor |
6–2, 6–4 |
| Loss | 1–5 | May 2023 | Mauthausen, Austria |
Clay | Germany Hendrik Jebens | Monaco Romain Arneodo Austria Sam Weissborn |
4–6, 2–6 |
| Win | 2–5 | Jun 2023 | Heilbronn, Germany |
Clay | Germany Hendrik Jebens | Victor Vlad Cornea Austria Philipp Oswald |
7–6(9–7), 6–4 |
| Loss | 2–6 | Jun 2023 | Lyon, France |
Clay | Germany Hendrik Jebens | Manuel Guinard Grégoire Jacq
|
4–6, 6–2, [7–10] |
| Win | 3–6 | Aug 2023 | Augsburg, Germany |
Clay | Germany Hendrik Jebens | Constantin Kouzmine Ukraine Volodymyr Uzhylovskyi |
6–2, 6–2 |
| Win | 4–6 | Sep 2023 | Como, Italy |
Clay | Germany Hendrik Jebens | Sweden Filip Bergevi Netherlands Mick Veldheer |
6–3, 6–4 |
| Win | 5–6 | Sep 2023 | Bad Waltersdorf, Austria |
Clay | Germany Hendrik Jebens | Italy Marco Bortolotti Italy Francesco Passaro |
6–1, 6–2 |
| Win | 6–6 | Oct 2023 | Orléans, France |
Hard (i) | Germany Hendrik Jebens | United Kingdom Henry Patten Australia John-Patrick Smith |
7–6(7–5), 7–6(14–12) |
| Loss | 6–7 | Nov 2023 | Ismaning, Germany |
Carpet (i) | Germany Hendrik Jebens | Sriram Balaji Germany Andre Begemann |
6–7(4–7), 4–6 |
| Loss | 6–8 | Mar 2024 | Lugano, Switzerland |
Hard (i) | Germany Hendrik Jebens | Netherlands Sander Arends Netherlands Sem Verbeek |
7–6(11–9), 6–7(1–7), [8–10] |
| Win | 7–8 | May 2024 | Mauthausen, Austria |
Clay | Germany Hendrik Jebens | United States Ryan Seggerman United States Patrik Trhac |
6–4, 6–4 |
| Win | 8–8 | Mar 2025 | Naples, Italy |
Clay | Austria Alexander Erler | Geoffrey Blancaneaux Albano Olivetti
|
6–4, 6–4 |
| Loss | 8–9 | Jun 2025 | Sassuolo, Italy |
Clay | Austria Alexander Erler | Australia Matthew Romios United States Ryan Seggerman |
6–7(4–7), 6–3, [7–10] |
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ITF World Tennis Tour finals
[edit | edit source]Doubles: 11 (5–6)
[edit | edit source]| Finals by surface |
|---|
| Hard (1–4) |
| Clay (3–2) |
| Carpet (1–0) |
| Result | W–L | Date | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|
| Win | 1–0 | Oct 2015 | Ismaning, Germany |
Carpet (i) | Austria Alexander Erler | Germany Kevin Krawietz Germany Tim Sandkaulen |
2–6, 7–5(7–5), [10–8] |
| Loss | 1–1 | Oct 2021 | M15 Lubbock, United States |
Hard | Slovenia Sven Lah | United States Sekou Bangoura Netherlands Gijs Brouwer |
4–6, 6–4, [5–10] |
| Loss | 1–2 | Nov 2021 | M25 Harlingen, United States |
Hard | Gabi Adrian Boitan
|
Philippines Francis Alcantara United Kingdom Mark Whitehouse |
6–7(3–7), 7–5, [7–10] |
| Loss | 1–3 | Feb 2022 | M25 Glasgow, United Kingdom |
Hard (i) | United Kingdom Charles Broom | Netherlands Gijs Brouwer United Kingdom Aidan McHugh |
6–4, 6–7(1–7), [4–10] |
| Loss | 1–4 | Apr 2022 | M15 Monastir, Tunisia |
Hard | Germany Tim Sandkaulen | Poland Szymon Kielan Poland Michał Mikuła |
6–7(4–7), 7–6(7–2), [2–10] |
| Win | 2–4 | Apr 2022 | M15 Monastir, Tunisia |
Hard | United Kingdom Charles Broom | China Li Zhe China Bu Yunchaokete |
7–5, 2–6, [10–8] |
| Win | 3–4 | May 2022 | M15 Meerbusch, Germany |
Clay | Germany Tim Sandkaulen | Chile Miguel Fernando Pereira Brazil Gabriel Roveri Sidney |
7–6(7–5), 6–4 |
| Win | 4–4 | May 2022 | M25 Most, Czech Republic |
Clay | Germany Tim Sandkaulen | Czech Republic Marek Gengel Czech Republic David Poljak |
6–3, 4–6, [10–7] |
| Loss | 4–5 | Jun 2022 | M25 Arlon, Belgium |
Clay | Germany Tim Sandkaulen | Anirudh Chandrasekar Vijay Sundar Prashanth
|
6–7(5–7), 4–6 |
| Win | 5–5 | Jul 2022 | M25 Kassel, Germany |
Clay | Germany Tim Sandkaulen | Germany Tom Gentzsch Germany Leopold Zima |
6–4, 6–2 |
| Loss | 5–6 | Aug 2022 | M25 Wetzlar, Germany |
Clay | Germany Tim Sandkaulen | Lebanon Benjamin Hassan Tristan Lamasine
|
4–6, 3–6 |
References
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External links
[edit | edit source]- Constantin Frantzen at the Association of Tennis ProfessionalsLua error in Module:WikidataCheck at line 29: attempt to index field 'wikibase' (a nil value).
- Constantin Frantzen at the International Tennis FederationLua error in Module:WikidataCheck at line 29: attempt to index field 'wikibase' (a nil value).